6 Jh. v'<c the Ittv. S. (haliani Bradc-Riiks— 



posterior end of tlie body is taken by Verhoeff to be an 

 erroneous observation. From tlie fact that Dubois did iu)t 

 find all Sco/ioj/lanes luminous, A'erliocff thou«;!it that the 

 best explanation would be that the sternal glands were 

 infested with luminous bacteria. He adds that Du))ois 

 asserted that Scolioplanes illuminated the whole body with 

 the exception of the head, but the anterior and posterior 

 parts of the trunk most strongly and persistently. In a 

 niore weakly luminous condition there was a eorres])oiidence 

 between the lii^ht and the situation and extent of the 



Yiix. 3. 



/k 



Chatechetyiie vesuviana. (i land-group of one of the pore-fields of the 

 ventral plates seen in section. 



cj, gland-cell ; fm, nuipcle-fibre. J. "NV. Smith & S. G. Vu-W. })liot.-deI. 

 [From Verhoeir, (12) pi. v. fig. 9, with some lettering omitted, after 

 Duboscq.] 



alimentary canal. In mentioning a subsequent assertion 

 of Dubois that Scoliophines can illuminate without any 

 appreciable^ giving up of a secretion and the same author's 

 (lucrv as to wlu-thcr the luminositv of the whole middle line 

 of the body would be pronoui.ccd if the luminous substance 

 arose fronj skin-glands, Verliocff ])oints out that a distri- 

 bution of glands over ain.ost all the sternites Avould be 



* "ohne irgeud eii) Secret abzu{>eben." 



